Analytics firm Localytics said that  Apple’s iOS 5 has already been downloaded enough to power 33 percent of all eligible iOS devices, with the iPad 2 and iPhone 4 leading the charge alongside the new iPhone 4S – which ships with iOS 5 from the outset. The company advises that “developers who haven’t updated their apps for iOS 5 should be submitting their new builds soon,” and that “the speed at which users are updating should be reflected in the speed at which app developers are pushing their new versions.”